x86 FDT and bootloader

x86 FDT and bootloader

[Christian Gmeiner]

Hi list,

I am very new to device trees and have some questions. I am working on an
embedded x86 device, which has some extra chips connected to an i2c bus.
As it is not possible to probe for these devices - no ID register etc
- I am looking
into DT/FDT.
How is it possible to pass the FDT to the linux kernel via grub? How far is FDT
support for x86?

Thanks
--
Christian Gmeiner, MSc

Re: x86 FDT and bootloader

[Grant Likely]

On Fri, Jul 01, 2011 at 01:59:51PM +0200, Christian Gmeiner wrote:
> Hi list,
> 
> I am very new to device trees and have some questions. I am working on an
> embedded x86 device, which has some extra chips connected to an i2c bus.
> As it is not possible to probe for these devices - no ID register etc
> - I am looking
> into DT/FDT.
> How is it possible to pass the FDT to the linux kernel via grub? How far is FDT
> support for x86?

I don't think any work has been done to pass DT using grub.  Right now
(IIRC) the DT is passed via the x86 boot protocol
(Documentation/x86/boot.txt), but I don't see the device tree bits in
the current mainline version of that document.

g.